Stencil for drawing structural details in technical plans.



H. SEEHASE & E. PANSEGRAU. STENCIL FOR DRAWING STRUCTURAL DETAILS IN TECHNICAL PLANS. APPLICATION FILED APR. 26, 1912.

1,087,326. Patented Feb. 17,1914.

e ,1, [I211 .6 in?) 13 f1 2 6 f 6Q 3 w r [1 13; I 1) g Z fj HANS SEEHASE, OF WARNEM'UNDE, AND ERIuH PANSEGRAU, 0F BERLIN, GERMANY.

STENCIL FOR DRAWING STRUCTURAL DETAILS IN TECHNICAL PLANS.-

Specification of Letters Patent.

.l atented Feb. 17, 1914:.

Application filed April 26, 1912. Serial No. 693,466.

To all whom it may concern Be it known that we, Hans Snnrmsn and Enron Pimsnonau, engineers, citizens of Germany, residing at Kirchplatz 9, Flamemiinde, in the Grand Duchy of Mecklenburg, and Turmstrasse 73, Berlin, in the Kingdom of Prussia, German Empire, have invented new and useful Improvements in Stencils for Drawing Structural Details in Technical Plans; and we do hereby declare the following to be a full, clear, and exact description of the same.

Stencils have alreac y been proposed for marking or painting the shapes of various objects, but these known stencils have not been specifically adapted to meet fully the extensive and varied requirements of engineers and architects draftsmen and others engaged in the preparation of technical drawings which, as is well known, frequently comprise a large number of structural elements which occur repeatedly, such as rounded corners of various sizes, slopes of usual gradients, representations of standardized machine parts, and diagrammatic representations of the same. Although their dimensions are known and invariable, these elements have to be re-drawn in every case, and itis therefore necessary to take the requisite dimensions from tables and then draw them to scale.

The object of the present invent-ion is to reduce to a minimum the time and labor needed for this work, by providing improved stencils especially adapted for facilitating the operation of plotting the outlines of what may be termed standardized structural elements or details.

In the improved stencil-plates, which are preferably formed (as usual) of transparent material, so much as may be necessary of the outline of each object to be drawn is represented by cuts only sufliciently wide to give passage to the sharp point of a pencil; the continuous piercing of the stencil-plate being restricted to certain parts of the outline, such for example as curved portions, which would otherwise require to be plotted with the aid of compasses or other special instruments, and the necessary indications for drawing such parts of the elements as are not fully represented by the cuts in the stencil being afi'orded by auxiliary marks pierced through the stencil plate. These auxiliary marks are so arranged that, with their assistance, the other necessary rectilinear supplementary portions of the structural elements are set out completely in shape and dimensions, and can then be drawn with the aid of the usual drawing instruments such as the T-square and ruler, without difliculty and with a minimum expenditure of time.

Several forms of the new stencils are illustrated in the drawing, Figure 1 showing part of a stencil for drawing screws with standard lVhitworth threads, Fig. 2 part of a stencil for drawing rivets, Fig. 8 part of a stencil for drawing inclines of usual gradients. Fig. 4 represents a one inch screw bolt which has been drawn with the assistance of the stencil shown in Fig. 1. i

The stencil or templet represented in Fig. 1 gives all the essential elements of nuts. The lines a which correspond with the profile of the nut can be drawn with the assistance of the stencil without any difliculty. By the points Z),'at which the curved outlines of the nut meet, the end lines for the edges of the nut are determined. The openings or cuts 0 show the inner diameter and the openings or cuts d the outer diameter of the screw thread. The holes 6 indicate the centers for describing the curve profiles of the nut, so that the compasses can be placed on the right point at once, when it is necessary to draw the parts in india ink. The holes 6 along the central axis of the element may also be employed for adjusting the stencil in position for use. The outer lines a adj o-ining the curves at of the nut are cut out to such an extent that the end points f or f indicate the level of the bolt head of a screw of the same diameter.

In Fig. 4 it is shown how a one inch screw bolt is drawn with the assistance of the stencil shown in Fig. 1. The full lines are drawn with the assistance of the stencil while the other parts, drawn with a T- square and triangle, according to marks obtained by the stencil are shown in dot-ted lines. A tangent to the curves a is the top boundary line 9 of the bolt head as usual, and by connecting the points f the bottom boundary line it of the bolt head is obtained. The boundary lines 2' of the sides of the bolt head are drawn with a T-square and triangle, the position of these lines being indicated by the full lines a and the points I) at which the curves a out each other. By using the marks d and 0 the outer diameter 7a of the stem of the bolt and the inner diameter Z of the screw thread can be drawn in the same way. I

The stencil shown in Fig. 2 gives all the dimensions of rivets, the cuts m also indicating the necessary length of stem for forming the closing head.

The characters 1 and 1/2 on the stenoil of Fig. 1 indicate the diameter in inches of the bolts of the nuts of such stencil, while the character 1 of Fig. 4: indicates the diameter in inches of the bolt shown therein. The numerals 16, 18 and 20 of the stencil of Fig. 2 indicate respective diameters in millimeters.

In the stencil shown in Fig. 3 for drawing inclines the holes 0 indicate the base line, so that by applying these holes to the base line, the gradients 1 :5 or 1:10 and others can be drawn by the aid of the stencil. All other structural elements, such as rolled sec tions, flanges, sleeve connections, gas pipe divisions, the usual edge-roundings for castings, cranks, etc., can, of course, be brought into stencil form according to our invention, either full size, or to any desired scale. Such stencils can also be employed to advantage by simply laying them on the drawing, without marking through them, in order to judge beforehand the effect of the proposed dimensions.

It is advisable to provide the stencil with the usual denomination of the structural eleroevgsae ments, so that this can be marked through on the drawing by means ot the stencil itself. Thus, Fig. 1 gives in this way the diameter of the bolt in inches.

What we claim and desire to secure by Letters Patent of the United States is An improved stencil for facilitating the operation of plotting the outline of structural elements or details wherein the outline is represented by cuts, the continuous piercing of the stencil plate being restricted to certain parts of the outline and the necessary indications for drawing such parts as are not fully represented being afforded by auxiliary marks pierced through the stencilplate, the stencil being a true rectangle hav ing sides perpendicular and parallel to the axes of the elements to be produced, the auxiliary marks being in such position relative to the cuts that the construction elements are completely determined with a single position of the stencil, the auxiliary signs being essential parts of the structural detail and exactly determined so they can be completely copied by single supplementary lines.

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

HANS SEEHASE. ERICH PANSEGRAU. lVitnesses ALFRED Dnori-i, HENRY HAsrnR.

Series of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

